Need help! Unlock Samsung [GT-S5570 / i5500 / Galaxy Ace]

Thank you in advance to anyone taking the time to read this and help.
This is my absolute last resort as I'm normally pretty tech-savvy and able to do things like this after a few attempts but something just isn't going right.

Basically i'm trying to unlock my phone and I found this guide: [TUTORIAL] Unlock Samsung [GT-S5570 / i5500 / Galaxy Ace]

Now I don't understand what the issue here is, whether the guide is missing...

Need help! Unlock Samsung [GT-S5570 / i5500 / Galaxy Ace]

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